9results about How to "Large pitch" patented technology

The invention belongs to the technical field of mine ventilation, and discloses a coal mine underground ventilation adjusting device which comprises a water storage box. Through cooperation of the interception assembly, the exhaust assembly and other structures, the exhaust assembly drives air in a mine and water sprayed by the water supply assembly to flow towards the side face of the filter plate and drives the spiral disc to rotate, and pulverized coal contained in the air is retained on the side face of the filter plate; a spiral disc rotates to concentrate pulverized coal and water to the middle of a filter plate and fall into a storage box, when the pulverized coal in the storage box is too much, the pulverized coal can descend, the pulverized coal is washed away by the water, a connecting rod can drive a guide ring to descend and rub the inner wall of a collecting pipe, and a mixture of the pulverized coal and the water adhered to the inner wall of the collecting pipe can also fall into the storage box. And therefore, the descending speed of the storage box is increased, the working efficiency of the device is improved, the water supply assembly can lift the two-way telescopic rod to the initial state again, and then the device can conduct pulverized coal cleaning and collecting work in a reciprocating mode.

The telescopic variable-pitch cross-medium propeller mechanism comprises a vane seat shell, a supporting frame is arranged in the vane seat shell, an electric telescopic rod assembly is arranged on the supporting frame, vane assemblies are connected to the left end and the right end of the electric telescopic rod assembly in a threaded mode, each vane assembly is formed by sleeving a plurality of multi-section vanes, and the vane seat shell and the electric telescopic rod assembly are connected in a threaded mode. The front end of the electric telescopic rod assembly is connected with a wing piece at the foremost end of the wing piece assembly, and the wing piece assembly is driven by the electric telescopic rod assembly to stretch and retract. Appropriate lift force is provided for the cross-medium aircraft or the aircraft, modular design is adopted, wing panel serialization design can be carried out according to the load requirement of the cross-medium aircraft or the aircraft, the wing panel extends into a large wingspan during air flight, the wing panel contracts into a small wingspan during underwater navigation, and the screw pitch of the propeller is increased.

The present application relates to a kind of polymerization device of high viscosity polymer, belong to polymerization reaction device technical field.The present application includes reaction main body, with reaction inner cavity, reaction inner cavity is equipped with even root for stirring high viscosity polymer's helical stirring shaft, helical stirring shaft includes main shaft and the helical blade connected in the outer side of main shaft, and the helical blade in each adjacent two helical stirring shafts is staggered with each other on the side of mutual approach;Main shaft is equipped with the heat-conducting medium passage that is penetrated from top to bottom, and the heat-conducting medium passage in each main shaft is connected by connecting short pipe to be connected to be the serpentine heat-conducting medium circulation total passage, one end of heat-conducting medium circulation total passage is heat-conducting medium inlet, and the other end is heat-conducting medium outlet, and heat-conducting medium inlet and heat-conducting medium outlet are located in the same end of the reaction main body;Reaction main body outer side is equipped with heating box, and heating box is used to heat heat-conducting medium, and heating box is located in the side close to heat-conducting medium inlet and heat-conducting medium outlet.

The utility model relates to the technical field of household appliance equipment, in particular to a heat exchange fin, a combustion heat exchange assembly and a gas water heater, the heat exchange fin comprises a fin body, the fin body comprises a first body extending transversely and a second body arranged at one end of the first body and extending obliquely; the first body and the second body are each provided with a pipe inserting hole allowing a heat exchange pipeline to be inserted therein. The first body is provided with at least two pipe inserting holes which are arranged at intervals in the transverse direction, one side face of the first body is provided with a protruding smoke blocking structure, the smoke blocking structure is arranged in the middle area of the two pipe inserting holes, and the smoke blocking structure comprises a first smoke blocking part, a second smoke blocking part and a third smoke blocking part which are sequentially arranged at intervals from bottom to top; in the direction from bottom to top, the width sizes of the first smoke blocking part, the second smoke blocking part and the third smoke blocking part are gradually increased. According to the fin capable of improving the heat exchange effect, the combustion heat exchange assembly which is provided with the fin and capable of improving the heating effect and the gas water heater are formed.

The invention discloses a tobacco roller with a spiral flow guide strip on the inner wall and a method for adding feed liquid into tobacco shreds and refrigerating dried tobacco shreds. The tobacco roller comprises a roller body, the spiral flow guide strip, a feed liquid injection pipe or a chilled water input pipe, a chilled water output pipe and the like, and the spiral flow guide strip is installed on the inner wall of the roller body; the cross section of the spiral flow guide strip is a sine curve surface, adopts a half-wavelength (lambda / 2) wave crest design, and is made of a stainless steel metal plate or a copper metal plate with the thickness of 1-2mm. When the essence is added by using the closed spiral flow guide strip, the injection holes with the diameters of 0.5-2mm are uniformly formed in the sine wave peak surface of the spiral flow guide strip, so that the essence is diffused to each space area in the roller, and the perfuming permeability is improved. When the device is used for refrigerating dried tobacco shreds, chilled water is input into the spiral flow guide strip to quickly refrigerate the tobacco shreds, so that the tobacco shreds are shaped and curled to improve the perfume absorption effect. The material loosening and conveying effect can be improved by replacing harrow nails in some rollers, the breakage rate is reduced, the material loosening and conveying device can be used for feed liquid adding of tobacco shreds or rapid refrigeration of dried tobacco shreds, and the process effect is obvious.

The present disclosure relates to a tool holding device (1, 1', 1") comprising a rotatable shaft (2, 2', 2") which is at least connectable to a tool drive power source (3) and comprises a first shaft thread (4, 4'). The tool holding device (1, 1', 1") comprises a threaded insert (5, 5'), which comprises a first insert thread (6, 6'), which is suitable for engaging the first shaft thread (4, 4') to form a first thread arrangement structure (4, 6; 4', 6'). The threaded insert (5, 5') comprises a second insert thread (7), which is suitable for engaging a tool thread (8) of a tool holding device (9), which tool thread is arranged to be screwed onto the second insert thread (7) to form a second thread arrangement structure (7, 8), the first thread arrangement structure (4, 6; 4', 6') having a larger pitch than the second thread arrangement structure (7, 8).

This invention discloses a porous personalized implant and its manufacturing method. The porous personalized implant includes an abutment and an implant body. The abutment is disposed on top of the implant body and connected to it via a neck. A threaded, porous layer is formed directly on the outer surface of the implant body. The porous layer is helical and has a non-uniform curved surface structure, resulting in an uneven surface. A porous support region is also provided on the outer surface of the neck, passing through the neck and communicating with the porous layer on the outer surface of the implant body. The porous personalized implant of this invention is integrally molded. The porous structure adopts the G-surface structure of the three-period minimal surface, solving the stress shielding and stress concentration problems of existing dental implants. Furthermore, it shortens the surgical cycle while reducing damage to the surface treatment layer during implantation, improving the osseointegration performance of the implant and meeting the needs of different patients.

The invention relates to the technical field of para-aramid fiber production, in particular to a para-aramid fiber polymerization device and a polymerization method. The para-aramid polymerization device comprises a pre-polymerization reactor and a polymerization reactor which are in butt joint, the pre-polymerization reactor comprises a horizontally-arranged machine barrel, a tile lining layer is attached to the inner wall of the machine barrel, a conical screw is arranged in the machine barrel, a screw driving motor and a pin assembly are arranged outside the machine barrel, and the pin assembly comprises a plurality of pins. The pin penetrates through the machine barrel and the tile lining layer in a sealed mode and then abuts against a main shaft of the conical screw, a notch for the pin to penetrate through is formed in threads of the conical screw, the tile lining layer, the main shaft and the pin are all of a hollow structure and are all communicated with a nitrogen cooling circulation system, and the tile lining layer is opposite to the flowing direction of nitrogen in the main shaft. According to the invention, feeding is carried out in an atomization opposite spraying manner, and a reciprocating extrusion mixing structure and a triple strong cooling structure are matched, so that the temperature control effect is good, the reaction material mixing and dispersing effect is good, the HCl-containing waste gas discharge efficiency is high, and high-quality para-aramid resin can be obtained.

The utility model discloses a conversion connector which comprises a connector body, a wrench clamping position is arranged in the middle of the connector body, and a conical transition structure is arranged on the upper portion of the connector body. Connecting threads are arranged at the two ends of the connector body. According to the utility model, the tapered transition structure effectively ensures the passing ability and smoothness of the variable caliber; the connecting threads are trapezoidal threads, the thread forms of the connecting threads are isosceles trapezoids, the thread form angle is 30 degrees, the inner threads and the outer threads are tightly attached through conical surfaces and are not prone to loosening, and the advantages of being good in tooth form strength, large in thread pitch, good in transmission performance, high in durability and the like are achieved.